DPF light flashing - you had your car serviced by non Mazda dealer right! The flashing DPF is the service interval reminder. it does not indicate a problem with the DPF . Many owners are being ripped off by garages replacing parts that don't need replacing. check out www.youtube.com/watch?v=NV3_TYoWzAs this will show you how to reset the flashing DPF for free.
DPF solid is a DPF problem, giving the car a good run down teh motorway should clear it. If not then it's going to cost :(
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